html,body,#root{
    width:100%;
    height: 100%;
    overflow: hidden;
}

*{
    margin:0;
    padding:0;
    list-style:none;
}
.wrap{
    width:100%;
    height: 100%;
    overflow: hidden;
    display: flex;
}


.left{
    width:200px;
    height: 100%;
    border-right:1px solid gray;
}

.right{
    flex:1;
    height: 100%;
    overflow: auto;
}

.active{
    color:red;
}